max_allowed_packet: This parameter defines the maximum size of a packet that can be sent or received by the MySQL server. The default value is 4MB, but it can be increased to up to 1GB.
innodb_buffer_pool_size: This parameter determines the amount of memory allocated for InnoDB buffer pool, which is used for caching data and indexes in memory. The maximum value for this parameter depends on the available physical memory on the system.
query_cache_size: This parameter sets the size of the query cache, which stores previously executed SELECT queries and their results in memory. The maximum value for this parameter is typically set at 512MB.
max_connections: This parameter sets the maximum number of simultaneous client connections that are allowed to connect to the MySQL server. The maximum value depends on system resources and workload, but it can be set as high as 10,000 connections.
tmp_table_size/max_heap_table_size: These parameters determine the maximum size of temporary tables created during queries. The default value is 16MB, but it can be increased to as much as 32GB.
key_buffer_size: This parameter sets the size of index buffers used by MyISAM storage engine for caching indexes in memory. The maximum value depends on available system resources and workload, but it can be set as high as 4GB.
table_open_cache: This parameter sets the number of open tables cached in memory by MySQL server. The default value is usually sufficient, but it may need to be increased if many tables are frequently accessed.
join_buffer_size: This parameter sets the size of buffer used for joins between tables that cannot use an index to find matching rows quickly. The default value is often sufficient, but it can be increased if necessary.
sort_buffer_size: This parameter sets the size of buffer used for sorting operations such as ORDER BY and GROUP BY clauses. The default value is often sufficient, but it can be increased if necessary.
read_buffer_size: This parameter sets the size of buffer used for sequential table scans. The default value is often sufficient, but it can be increased if necessary.
